Centrifugal extractor



(No Model.)

W. T. FORBES. GBNTRIFUGAL EXTRAG'I'OR.

No. 433,839. Patented July 29, 1890.

WITNESSES: l/VVE/VTOR ATTORNEY.

UNlTED STATES Parent Unmet.

\VALTER T. FORBES, OF ATLANTA, GEORGIA.

CENTRIFUGAL EXTRACTOR.

SPECIFICATION forming part of Letters Patent No. 433,339, dated July 29, 1890. Application filed March 13, 1890- Serial No. 343,777- (No model.)

To all whom it may concern:

Be it known that I, \VALTER T. FORBES, a citizen of the United States, and a resident of Atlanta, in the countyof Fulton and State of Georgia, have invented certain new and useful Improvements in Centrifugal Extractors; and

I do hereby declare the following to be a full,

clear, and exact description of the invention,

tractors, and has particular reference to such. improvements in said device as will adaptthem to use in extracting oil from vegetable or animal substances, the details of all of which are hereinafter set forth.

In the accompanying drawing is shown a longitudinal vertical section of the device, showing in conventional form means for applying pressure to the improved stuffinggland and other details of construction.

The centrifugal extractor A is provided with a casing a, which is practically air-tightthat is, the joints are so tight as to prevent the passage out of the gas evolved from the solution in the process of extracting said so lution from the material with which the centrifugal extractor is charged.

In the employment of this device it is at present preferable to dissolve the integuments of the oil-cells with naphtha. It is a well-known fact that operatives cannot inhale the gas evolved from naphtha without being disabled from work until the effects of the inhalation pass off, and hence it is absolutely necessary that there be no leakage of gas from the said casing 0, nor, in fact, from any part of the apparatus where said gas might find passage into the outer air, which is ren dered more necessary by the inflammable nature of the said gas. Casing a is made lllfllll] in the construction shown by means of the cover a, which may be bolted securely down over the top of the casing; but it is prefer ably so secured thereon as to be easily removable for the purpose of gaining access to the interior of the extractor for the purpose of charging and discharging. A very con venient construction for this end is that shown in the drawing, in which the cover is hinged on one side to the said casing and provided with a number of swivel-bolts having handnuts thereon, which areturned on their swivels 011 the casing, and passing into notches in. said cover may be tightened by revolution of said nuts.

The pipe at" connects with the manifold or conduit leading to a suitable condenser for liquefying the gas arising from the solvent,

preventing loss in the process by carrying to said condenser from the casing a the naphtha-gas driven off.

The shaft Gof the extractorA is journaled at its lowerend in any suitable manner, preferably in an adjustable step. The upper end of said shaft is journaled in the bottom of the casing, and to prevent any leakage of material packing is employed, said packing being applied as follows: On the under side of the bottom of the casing is a downwardly-projectin g screw-threaded ring 6, which encircles the shaft and has a conical concavity on its under side, being threaded on its outer side to receive the casting E, which has an internally-screw-threaded portion for the purpose of screwing it onto the said ring 6. Thelowcr end of the casting E is a duplicate of the upper end just described, and has a collar screwed therein in substantially the same manner as the ring c. Between the stuflingboxes just described is an annular chamber c in the said casting E, which is connected internally by means of the pipe c" with the tank 6 or other source of pressure-for instance, a pump or an air-cushioned receiver. The liquid packing agent is water or heavy oil, which, by being forced into the annular chamber 6 with a sufficient degree of force, will form a counteraction to the pressure forcing the leak, and will consequently prevent any leakage of gas or liquid around the shaft. Itis obvious that should any naphtha pass into the chamber c it will be either absorbed into the liquid therein contained or float on the top thereof and cannot escape into the air.

Secured to the upper end of the shaft 0 is the disk D, having an upwardly-projecting flange 6?, which fits around the circumference basket B, said basket being set down into the depression surrounded by the said flanges d, said flanges preventing any lateral displacement. The cylinder is secured to this disk by suitable set-screws d passing through the flanges d and engaging with the circumference of the said cylinder or basket 13 near its bottom. I do not confine myself, however, to the use of these set-screws, as the same end might be attained in many ways without a departure from the spirit of this invention. For instance, pins projecting upwardly from the upper surface .of said disk might enter corresponding holes in the bottom of the basket, thus causing said basket to revolve with the said disk. Said basket B is formed with sides and bottom, and is perforated in its circumferential portion with apertures of suitable size, and has for the purpose of causing perfect filtration alining b of material of the required texture and strength, said fabric being placed upon the inner side of thecircumferential walls of the said basket. This lining Z7 may be of hair-cloth, press-cloth, or felt, and for some substances a wire-gauze might be used, the centrifugal force, however, necessitating a strong outer wall for the basket. This liningb is secured to said cylinder by fastening it at its edges to the basket 13, for which purpose any suitable means may be used. However, as it will not be necessary to very frequently remove this lining b, it may be securely fastened therein, facility of removal being a matter of small importance. I

The pipes F and G, entering the casing a near its top, preferably from opposite sides thereof, are for the purpose of introducing the liquid solvent and the meal-cleansing agent (preferably live steam,) said pipes being cut by suitable valvesf and g. On the inner ends of these pipes are screwed one half of the pipe-unions 2', the other halves being screwed on the pipe I*I,which passes from one to the other of the pipes F and G, being cut at its center by a T-pipe, into which is screwed a downwardly-projecting perforated pipe I. It will be seen that thus the said pipe I has connection internally with either the naphthatank or the steam-boiler. This pipe I may be either closed at its bottom or perforated, as desired, the said pipe being otherwise perforated to the entire length of its projection into the material when the desired amount of said material has been charged into the basket B, said perforations being sufficient in size and number to cause a thorough permeation of the oil-bearing material when the said basket is revolved.

Pipe-unions are used at the connection of the pipe 11 with the pipes F and G in order that said pipe I-I may be readily removed should it be desired to take the basket out and replace it with a basket charged with oilbearing material, the advantage of which is in saving time. The pipe J, having valve j, leads from the casing a to the storage-tank for storage of the solution which,in the use of this centrifugal machine in extracting oil, would probably be interposed between the centrifugal extractor and suitable vaporizing or separating apparatus.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a centrifugal machine, the air-tight casing a, the'perforated cylinder B, j ournaled within said casing, the means for rotating said cylinder, the pipe Renter-ing said casing and having attached thereto by means of a union-fitting the pipe H, having the perforated branch pipe I, projecting downwardly at about the center of said cylinder,where'- by the cover of the extractor may be removed without disturbing said pipe, substantially as and for the purpose specified.

2. In a device of the class described, the casing 0, having shaft 0, carrying cylinder B, and the gland E, having annular chamber 6, pipe 6'', and means for filling the said chamber (2' with la liquid under pressure and of holding the same under pressure, substantially as and for the purpose specified.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

I VALTER T. FORBES.

Witnesses:

A. P. Woon, S. M. WooD. 

